Device for preventing excessive pressure in pneumatic tires.



W. H. VAN WNKLE.

DBVIC'F FUR PBEVBNTING EXGBssN/E PRESSURE N PNEUMATH: TIRES.

PPLlGA'llON IIILED JULYl, 10H.

@ngi

, pointer 3Q and indicating niedia 33.

ible material, such as leather. A spiral spring' 30 engages between thehead 27 of the valve and the upper end of the chamber 25. A port 31permits escape of air from the chamber. The tension on the spring,` isadjusted by changing the relative positions of the valve casing and thevalve Seat, the

'casing being screwed upon the seat. For

the purpose of indicating the pressure of the spring on the valve, astinger 32 secured to the valve seat has its pointed end adjacent to thebarrel of the valve casing. This casv ing is provided at this point withsuitable media 33, indicating the pressure in pounds per square inch atwhich the valve vvill open when the casing is in different positions andthe spring E() e3; di'derent pres VIures upon the valve member. A stopSel prevents rotation through more than one revolution.

The device is adapted to be attached to the valve stem of the tire afterthe latter has been pumped to the desired degree. Before being att,ched, the tension on the spring 30 is adjusted to the desired amount orelse at maximum. it it is desired., it may be adjusted tu the desiredmaximum after it is in place. The valve body .is turned so Ythat theproper tension is put upon the spring, as shown by the position of theIt the pressure in the tire vbe greater than -the pressure of the valve2G upon its seat, the latter will be lifted, allowing t-he air in thetire to escape until the springseats the valve. Willen the tire is inuse, siould the pressure increase, the air will harinlessly pass out,lifting the valve 2G, Without any injury to the tire. Ey this meansblow-outs and eX- plosions caused by excessive pressure in the tire areprevented.

in accordance with the provisions of the patent statutes, l havedescribed the principle of my invention, together with the apparatuswhich I new consider to represent the best embodiment thereof; but Idesire to have it understood that the apparatus shown is merelyillustrative and that the invention can be carried out in other Ways.

'Having new described my invention, what l claim as new and desire tosecure by Letters Patent, is

A relier' valve for pneumatic tires, coinprising an attaching nut, alinger carried thereby Awhich is adapted to engage with and open thevalve in the valve stein of the tire, a neck removably attached to saidnut, a valve seat removably attached to said neck, a valve membercooperating with said valve a casing inclosing the valve member andhaving a threaced connection With said valve seat, a spring Within thesaid casing and engaging with the valve member, a pointer secured to thevalve seat and lying aver the outside of said casing to indicate casingadapted to be engaged by the pointer and limit the extent of rotarymovement of the casing to one revolution.

This specification signed and witnessed this fourteenth day of July,1911.

VALTER H. VAN NINKLE llfitnesses:

FLORENCE B. HARDY, lV. H. VAN VINKLE, Jr.

the position of the latter, and a stop on the

